@MrLucasBrice
Its a little simple to say, would either know its my signature or not if someone asks about your signature. A well forged signature attached to a type of document you frequently sign may not be such an easy signature to dismiss.

ON THE OTHER HAND-
Unless Mark Zuckerberg had a real bad habit of signing a lot of these type of documents one would fully expect that he would recall signing such a significant document.ocument. Its a pretty important document, its well beyond the monthly rent check so to speak.

The mere fact Mark Zuckerberg cant say "I never signed that kind of document in my life" I would expect only leads to the conclusion that he must have signed something very much like that document at one time. Even giving him the full benefit of doubt would still result in him having signed a document at least very similar to that and perhaps that very one. The only question would be is "is this the actual document he did sign". In a case like this saying anything less then "its 100% a forgery because I never signed such a document" actually means at least "I did sign something very much like that once but I don't think this is it".

Obvious and interesting.